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MCQs

Total Questions : 203 | Page 19 of 21 pages
Question 181. . The cut of a tunnel face is shown in Fig. 24.2. This is called
  1.    Michigan cut
  2.    Burn cut
  3.    Fan cut
  4.    Horizontal cut.
 Discuss Question
Answer: Option A. -> Michigan cut
Question 182. . The following operations are required for tunnelling in rockYAerrain? 1. Renmving the foul gases 2. Marking the tunnel profile 3. Setting up and drilling 4. Checking misfire 5. Mucking The correct sequence is :
  1.    1,2,3,4,5
  2.    2,3,5,4,1
  3.    4,2,1,3,5
  4.    2,3,1,4,5.
 Discuss Question
Answer: Option D. -> 2,3,1,4,5.
Question 183. .  To attain the required shape of the 'tunnel section, we use :
  1.    easers
  2.    trimmers
  3.    cut holes
  4.    chisels.
 Discuss Question
Answer: Option B. -> trimmers
Question 184. .  The concentration of the dust particles of the size 0.5 to 5 microns adjacent to the working face should not be more than
  1.    200 particles/cm3
  2.    250 particles/cm3
  3.    300 particles/cm3
  4.    450 particles/cm3
 Discuss Question
Answer: Option D. -> 450 particles/cm3
Question 185. . Which one of the following linings is suitable for shield driven tunnels particularly in the subaqueous regions :
  1.    Brick lining
  2.    stone lining
  3.    timber line
  4.    cast iron lining
 Discuss Question
Answer: Option D. -> cast iron lining
Question 186. . Pick up the explosive used for tunnelling in soft rocks from the following :
  1.    blasting gelatine
  2.    special gelatin
  3.    ammonia dynamite
  4.    semi-gelatine.
 Discuss Question
Answer: Option C. -> ammonia dynamite
Question 187. . Pick up the correct statement from the following during tunnel excavation,
  1.    Oxygen should not be less than 19.5%
  2.    Carbondioxide should not be more than 0.5%
  3.    Hydrogen sulphide should not be more than 0.001%
  4.    All of the above.
 Discuss Question
Answer: Option D. -> All of the above.
Question 188. .  High pressure grouting is generally restored for concreting in the lining if the rock strata is :
  1.    highly fissured
  2.    poor
  3.    likely to get seepage of VTater
  4.    All of the above.
 Discuss Question
Answer: Option D. -> All of the above.
Question 189. . Concrete lining is provided concurrently with the driving operation in case of
  1.    rock terrain
  2.    soft rock
  3.    running soil
  4.    none of these.
 Discuss Question
Answer: Option A. -> rock terrain
Question 190. . Which one of the following methods is adopted for permanent drainage of tunnels :
  1.    provision of longitudinal drains
  2.    continuous open drains
  3.    concrete lining
  4.    All the above.
 Discuss Question
Answer: Option D. -> All the above.

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